Trussed bar for reinforced concrete construction.



P. STRAGIOTTI.

TRUSSED BAR FOR REINPORGED CONCRETE CONSTRUCTION.

APPLICATION FILED MAY 27, 1909.

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TBUSSED BAR FOR REINFORCED CONCRETE CONSTRUCTION.

Specification of Letters Patent.

Patented Apr. 12, 1910.

Application filed May 27, 1909. Serial No. 498,620.

To all "whom "it may concern:

Be it known that I, PIETRO STRAGIOTTI, citizen of Italy, residing at Hurley, in the county of Iron and State of Wisconsin, have invented new and useful Improvements in Trussed Bars for Reinforced Concrete Con-.

struction, of which the following is a specification.

My invention relates to reinforced concrete construction, and pertains particularly to a new kind of trussed bar for reinforced concrete beams, girders, railway ties, railway rails, and the like, possessing every advanta e of the I-beam or T-rail of large size, and resulting in an economy of metal over the usual Lbeam.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which- Figure l is a side elevation of a trussed bar. Figs. 2, 3, 4 and 5 are cross-sections of various types of longitudinal bars used in the construction of Fig. 1. Fig. 6 is a section on line X-X of Fig. 1. Fig. 7 is a detail of a longitudinal bar and its method of connection with a zigzag bar. Fig. 8 is a detail of one form of bend for a zigzag bar. Fig. 9 is a cross-section of a trussed bar suitable for railway rails.

One of my trussed bars or I-beams, such as shown in Fig. l, is made up of two longitudinal parallel bars A and B, which in an I-beam construction will have the cross-section of Fig. 2; these upper and lower bars AB being connected by the two zigzag bars (3-6, which zigzag between the bars AB in opposite directions, each zigzag bar being connected at the bends to the parallel bars by a super-bending and clenching of the intermediate web or flange F on one or other of the bars AB. The shape of the cross-section of a bar i or B need not always be-exactly as in Fig. 2, but may undergo certain changes according to the use for which the structure is intended. For I-beam structure the form of Fig. 2 or Fig. 4 would usually be employed; while for railway rails, and especially for the tread portion thereof, the form of Fig. 3 or Fig. 5 would be employed. The fundamental characteristic of all these bars is the central longitudinally -extending web or flange F with the two grooves D at its base,

back and forth 1 a suificient amount of metal being left on the outside of these grooves to form their outer walls and give body to the rail. The flange'F constitutes the common wall of the two channels D and projects above the same. \Vithin these channels the zigzag bars seat at their bends; the flange F being bept alternately to one side or the other by hydraulic pressure, or other suitable means,

to overlap the bent portion of the zigzag bars. as shown in Figs. 6 and 7.

in constructing this trussed bar, the two bars AB are arranged parallel, as shown in Fig. 6, with the grooves l and 2 of bar A opposed to the bars 12 of bar B. The zigzag bars may be bent with sharp elbows, as shown in Fig. 8, or they may be bent as represented in F ig. 1. The bar C zigzags from channel 1 of longitudinal bar A to channel 1 of longitudinal bar B, and the bar C zigzags from the channelzZof bar Ato the channel '2 ofbar B. While the relative positions of the two zigzag bars OC may be arbitrary, it is of some advantage that they proceed alternately, so that the flange F may be bent alternately to right or left to clench and hold the bent sections of both bars. An attachment of this kind is very good in itself, because the securing eflect of the flange extends to the whole portion of the zigzag bar griplped by the flange, as represented at n n *ig. 7.

The concrete mixture when applied to the finished structure, not only acts as a protection, but as a connecting means, for its adhesiveness and rigidity establishes forthwith continuous connections between the zig zag bars and the longitudinal ones. It also acts further by cooperating to insure the attachment just described, because in the concrete any loosening of the bars is impossible.

To illustrate, assuming that in the portion z-t, Fig. 7, of the zigzag bar, there is exerted a tensional force: This force tends to bring up the bent portion of the flange between ai -n for the reason that a tensional strain tends to straighten the bar; but in order'to go up, the flange is not only opposed by its own resistance, but its tendency is resisted by the concrete above which is strong on compression. Therefore, the several parts cooperate in the best possible manner to increase the solidity of the whole structure.

In 9, I show the application of the same principle in the manufacture of railway rails.

One important application of a trussed bar of this kind is in the making of rails for railroads in reinforced concrete, for in this const-ruction the'same amount of steel may used, but the resistance will be very much increased; the rail being, as a whole, compact and less sensitive to the pulls and vibrations. This rail may be made practically continuous, except for such necessary openings or gaps occasionally to allow for expansion and contraction. This increased resistance of the rail allows the ties to be placed at a greater distance from each other. Naturally in this railway rail construction Y the longitudinal bars are exposed, as shown pair of longitudinal -bars' one of id zigza 'sidebf said flanges afid the other zigzag bar in Fig. f 9, so that the up er bar forms a tread for the wheels, and the lower bar forms the base of the rail so that it can be spiked to the ties.

Having thus describedmy invention, what I claim and desire to secure by Letters Pat-' cut is 1 A structural metal shape comprising a bars, each of said bars aving a central lengthwise extending flange, the flanges on said bars opposed to each other said ars having suitable seats on each side of the flanges, and zigzag bars ex "fl tending between the longitudinal bars and fitting in said seats, said flanges bent over alternatelyin opposite directions to grip the bent ortions of said zigzag bars.

'2. trussed structural shape comprising upgerand lower longitudinal bars, each of sai bars having groove flange, and a pair of zigbetween the'longitudinal bars being onone on eachside of'its zag bars extending onthe other 'side of said flanges, withttheir I bends arrangedalternately, and said flanges alternately clench the bent portions of y a lengthwise extending flange, each bar having a longitudinal bent to one side or the other to clench the bent portions of said zigzag bars.

3. A trussed structural shape comprising upper and lower longitudinal bars, each of said bars having ,a lengthwise extending flange, each bar having a longitudinal groove on each side of its flange, a pair of zigzag bars extending between the longitudinal bars, one of said zigzag bars beingon one side of said flanges and the other zigzag bar on the other side of said flanges, with their bends arranged alternately, said flanges alternately bent to one side or the other to said zigzag bars, and a concrete filling in which said zi za bars are embedded,leaving the longitu iniil bars exposed.

4. A trussed bar including a longitudinal bar having a lengthwise extending flange,

and said bar having a lengthwise extending groove on each side of the flange, and a pair of zigzag bars, one of which seats in one groove and the other" of which seats in the other groove, and the flange-bent alternately to one side or the other to grip the bent portions of said zigzag bars.

5. A trussed structural s'hape comprising upper and lower nesses.

PIETRO STRAGIOTTI. Witnesses: ALBERT R. -TAYLOR,

Jos, J. FREDERICKSON. 

